Preheater



H. W. WIEDERWAX.

PREHEATER.

APPLICATION FILED Nov. I4, 1919.

1,338,472. I Patented Apr. 27, 1920.

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PREHEATER.

APPLIcAnoN FILED Moy/.14. 1919.v

Patented Apr. 27, 1920.

R. W.'WIEDERWAX.

PREHEATER.

APPLxcATxoN FILED Nov. 14. 1919.'

1,338,472, Patented Apr. 27, 1920.

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ROBERT WALTON WIEDERWAX, OF ATLANTIC CITY, NEW' JERSEY, ASSIGNOR OF ONE- I-IAIF TO CARLTGN GEIST, 0F ATLANTIC CITY, NEW JERSEY.

PREHEATER.

Specification of Letters Patent.

Patented Apr. 27, 1920.

To all whom t may Concern:

Be it known that I, ROBERT W. WIEDER- wAx, a citizen of the United States, residing at Atlantic City, inthe county of Atlantic and State of New Jersey, have invented certain new and useful Improvements in Freheaters, of which the following is a specication.

This invention relates to preheaters.

An vimportant object of the invention is to provide a preheater for use in heating castings or the like preparatory to a welding operation.

A further object of the invention is to provide such an apparatus having means to gradually and evenly heat the castings prior to welding andto gradually and to evenly cool lthe same after the welding operation.

A further object' ofthe invention is to improve the construction shown in lmy prior Patent Number 1,27 5,638.

Other objects and advantages will be apparent throughout the course of the following description.

In the Vaccompanying drawings wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein like numerals designate like parts throughout.

Figure 1 is a plan view of my apparatus.

Fig. 2 is a side elevation thereof.

Fig. 3 is a section taken on the line 3 3 of Fig. 1. 4

Fig. 4 is a section taken on the line 4-4 of Fig. 1.

Fig. 5 is a section taken on the line 5-5 of Fig. 2.

Fig. 6 is an enlarged section showing the attachment of the gas outlet cap.

Fig. 7 is a perspective showing the Inanner in which the casting supports are assembled.

Fig. 8 is a fragmentary perspective of one of the air inlet pipes.

Fig. 9 is a perspective of the gas outlet cap, and

Fig. 10 is 'an enlarged side elevation of the burner tube.

Referring now more particularly to the drawings the numeral 5 designates a main casing, supported by legs 6. One side of the casing is provided with a door opening 7 adapted to be covered by a vertically swinging door, vhinged at its lower` edge as l their length.

`at 9. The door is held closed by spring latches 10 or the like, and is equipped near its upper end with a handle 11 as shown.

Horizontal combined supports and air pipes 12 are provided extending longitudinally of the casing and dividing the casing into upper and lower compartments 13 Aand 14 respectively. The air pipes 12 have open ends 15 which extend through the main casing 5 for communication with the atmosphere, and are provided with downwardly extending openings 1G spaced throughout Arranged intermediate and in alternate relation with the longitudinal air pipes are gas and air mixing burner tubes. These tubes 17 are arranged in the same horizontal plane as the air pipes 12. The tubes 17 do not extend for the full length ofthe casing but terminate approximately centrally thereof and their inner ends are supported 'by a transverse support 1S shown in this present instance as comprisinga T bar having the vertical member of the T extending downwardly. vThis horizontal support,l also forms a support for the air pipes 12. The gas and air mixing burner tubes 17 are tapered throughout their length, the inner ends thereof being the smaller and are provided upon their upper surfaces with vertically extending outlet tubes 19 having a bore 20, furnishing communication with the interior of the pipe. The upper ends of the tubes are provided with substantially mushroom shaped caps 21, having depending radial legs 22, having` offsets forming shoulders 23 adapted to engage the upper end of the tube 19 while the offset portions engage the exterior thereof. As will be seen by inspecting Fig. 5, the gas outlet tubes 19 are arranged in staggered relation thus givingl a more even distribution of the 'flame throughout the compartment 13. The outer ends of the gas and air mixing burner tubes 17 may be provided with any form of air and gas mixing valve to improve the combustion and the outer ends of each set of gas burner tubes are connected to header 24, which in turn communicates with a common pipe 25 connected with any suitable source of combustible fuel supply.

The tapered construction of the gas burner tubes allows of a uniform pressure throughout the length thereof, and consequently eliminates the common difliculty of too great a pressure adjacent the inlet ends and not enough remote therefrom. In the ordinary construction the greatest heat is supplied adjacent the inlet end with consequent uneven heating, which is often disastrous in the heating of castings in that if one end of the casting is heated more rapidly within the other there is a tendency of the metal to crack. Furthermore, it will be noted that this tapered construction causes the gas and air to thoroughly commingle before leaving the burner tubes. It will also be seen that the air and gas pipes cooperate to form a grid the purpose of which will presently appear.

In the upper compart-ment 13 and adjacent the upper edge thereof are provided longitudinal supports 26 provided at spaced intervals with notches 27 adapted to receive transverse bars 28. In the present instance I have shown these longitudinal supports as resting upon angle iron braces 29. Y

The upper compartment 13 is more or less filled with aggregates 30 of refractory material, preferably formed of silica. These aggregates are supported by the grid formed by the air inlet pipes 12 and gas and air mixing burner tubes 17. The purpose of the mushroom caps 21 will now appear.- It will be obvious to those familiar with the art that in the course of use the aggregates 30 have a tendency to disintegrate and were the upper ends of the gas outlets uncovered these aggregates would cholre the outlets and interfere with the efficiency of the burner. These caps also cause the flame from each outlet to spread over a wide area which with the staggered relation of the burner outlets causes a very even distribution of the flame throughout the refractory aggregates 30. As the caps 21 will be subjected to a high degree of heat they are preferably non-metallic being formed of lava or the like.

In the operation of the device the gas is turned on and passing into the gas burner tubes draw in air which is commingled with the gas in the tapered tubular body portions thereof. This mixture then passes out through the openings 23 of the burner caps. When ignited the aggregates 30 of the refractory aggregates quickly become incandescent and the body portions ofthe gas inlet tubes become heated, and cause the drawing in of additional. air resulting in increased intensity of the flame.V Combustion then becomes general throughout the entire mass of the refractory material and is assisted by air drawn in through the air inlet pipes 12. This air is drawn into the tubes by the draft or suction caused by the heat of the incandescent refractory material and is assisted by air drawn in through the air inlet pipes 12. This air is drawn into the point is evenly distributed throughout the` refractory mass in the upper compartment thereby perfecting the combustion therein. The fact that a current of air passes through these pipes prevents their being warped and destroyed by the heat to which they are subjected. It will be obvious that the apparatus operates with a very low consumption of the gaseous fuel.

It will be seen that the air inlet pipes and gas burner tubes are subjected to a fairly high degree of heat, and distortion thereof from the weight of the aggregates is prevented by the transverse support. In event the longitudinal supports ,in the upper end of the upper compartments become burned out, they are readily replaced.

Attention is particularly directed to the tapered construction of the gas inlet tubes 17. By this construction, the air and gas completely commingle and a uniform quantity at a uniform pressure is made available for each of the burner caps 21. Y

Further attention is directed to the arrangement of the air inlet pipes 14C which allows of the admission of additional air for combustion at the time when it is most needed and not before. It will further be seen that the higher the degree of heat in the refractory material, the greater the amount of air which will be supplied for combustion. This delivery is entirely independent of suction by the gaseous fuel and is very evenly distributed throughout the aggregates. In addition to the function above described, the air drawn in by the air inlet tubes performs a second function, that of equalizing the temperature throughoutthe lower compartment. It will be noted that the openings of the tubes extend downwardly and the air will circulate within the lower compartment 14: before passing upwardly through the aggregates 30. The air inlet tubes will of course in use become heated heating the air as it is drawn in and the maintenance of an even temperature within the lower compartment thereby aided. It will be obvious that the maintaining of an even temperature in the lower compartment is necessary in order that a heated article placed within the compartment to cool may be so cooled without in any way distorting the article or fracturin g it.

What I claim is:

1. In apparatus of the type described, a casing, spaced horizontal air inlet pipes within said casing, gas burner tubes arranged in alternate relation with said air inlet pipes and coacting therewith to form a grid dividing said casing into upper and Lesa-rre therewith and coacting therewithtoA form a grid dividing said casing into upper and lower compartments, and refractory aggregates disposed within said upper compart-` ment and supported by said grid.

3. In apparatus of the type described, a casing, spaced horizontal air inlet pipes, gas burner tubes arranged in alternate relation with said air inlet pipes and coacting therewith to form a grid dividing said casing into upper and lower compartments, refractory aggregates disposed within said upper compartment and supported by said grid, longitudinal supports arranged within said upper compartments and above said aggregates, said supports being provided in their upper faces with notches and transverse supporting bars resting within said notches.

4. In apparatus of the type described, a casing, spaced horizontal air inlet pipes within said casing, gas burner tubes extending inwardly from opposite ends of the casing arranged in alternate relation with said air inlet pipes and coacting therewith to form a grid dividing said casing into upper and lower compartments, refractory aggregates disposed within said upper compartment and supported by said grid and a central transverse support receiving the inner ends of said burnertubes and supporting the air inlet pipes centrally'thereof.

5. In apparatus of the type described, a casing, spaced horizontal air inlet pipes having outlet openings within said casing, the ends of said pipes extending through the walls of said casing and being open and tapered-gas burner tubes arranged in alternate relation with said air inlet pipes and provided with outlet openings, the openings of said gasburner tubes being staggered with respect to the openings of said air inlet pipes.

G. In apparatus of the type described, a casing, spaced horizontal air inlet pipes having downwardly extending outlet openings within said casing, the ends of said pipes extending through the walls of said casing and being open, gas burner tubes arranged in alternate relation with said air inlet pipes and provided with upwardly extending inlet openings, the openings of said gas burner tubes being staggered with respect to the openings of said air inlet pipes, said gas and air inlet pipes coacting to form a grid dividing said casing into upper and lower compartments and mineral aggregates disposed withln said upper compartment and -supported by said grid.

7. In apparatus of the type described, a casing, alternate gas burner tubes and air inlet pipes within said casing and forming a grid dividing the casing into upper and lower compartments.

8. Inapparatus of the type described, a

casing, alternate gas burner tubes and air inlet pipes within said casing and forming a grid dividing the casing into upper and lower compartments, said gas burner tubes being tapered and having their small ends remote from the intake end thereof.

9. In apparatus of the type described, a casing, alternate gas burner tubes and air inlet pipes in said casing and forming a grid dividing the casing into upper and lower compartments, refractory aggregates disposed within said upper compartment and supported by said grid, and spaced vertical tubes formed upon the upper surfaces of said gas burner tubes having a bore communicating with the interior thereof, said tubes extending upwardly intermediate said refractory aggregates.

10. In apparatus of the type described, a casing, alternate gas burner tubes and air inlet pipes within said casing and forming a grid dividing the casing into upper and lower compartments, refractory aggregates ydisposed within said upper compartment and supported by said grid, spaced vertical tubes formed upon the upper-surfaces of said gas burner tubes and having a bore connuunicating with' the interior thereof and a mushroom shaped cap 'disposed over the upper end of said vertical tubes and provided upouwits under side with gas outlet` openings.

11. In apparatus of the type described, a casing, alternate gas burner tubes and air inlet pipes within said casing and forming a grid dividing the casing into upper and lower compartments, refractory aggregates disposed within said upper compartment and supported by said grid, spaced vertical tubes formed upon the upper surfaces of said gas burner tubes and having a bore communicating with the Ainterior thereof, mushroom shaped caps disposed over the upper ends of said vertical tubes and provided with radial legs depending from the under side thereof adapted to engage portions of the exterior and upper ends of the vertical tubes andspaces intermediate said legs forming gas outlet openings.

12, In apparatus of the type described, a casing, alternate; gas burner tubes and air inlet pipes within said casing and forming a grid dividing the casing into upper and lower compartments, refractory aggregates disposed within said upper compartment and supported by said grid, spaced vertical tubes formed upon the upper surfaces of said gas burner tubes and having a bore communicating with the interior thereof, mushroom shaped caps disposed over the upper ends of said vertical tubes and provided with radially disposed legs depending from the under side thereof, adapted to engage portions of the exterior wall and upper end of the vertical tubes, said air inlet pipes being provided with outlet openings, the vertical tubes of each of said burner tubes being staggered with relation to those ofthe next adjacent burner tubes.

13. In apparatus of the type described, a casing, spaced horizontal air inlet pipes within said casing, gas burner tubes, arranged in alternate relation,` with said air inlet pipes and coacting therewith to form a grid, and refractory aggregates disposed within said casing and supported by said grid.

14. In apparatus of the type described, a casing, alternate gas burner tubes and air inlet pipes within said casing and forming a grid, refractory aggregates disposed within said easing and supported by said grid, and spaced vertical tubes formed upon the upper surfaces of said gas burner tubes having a bore Communicating with the interior thereof, said tubes extending upwardly intermediate said refractory aggregates.

15. In apparatus of the type described, a casing, spaced horizontal air inlet pipes within said casing, gas burner tubes extend ing inwardly from opposite ends of the cas-- ing arranged in alternate relation with said air inlet pipes and coacting therewith to form a grid, refractory aggregates disposed within the casing and supported by said grid, and a central transverse support receiving the inner ends of said gas burner tubes and supporting the air inlet pipes ecntrally thereof, said gas burner tubes being tapered throughout their length.

16. In apparatus of the type described,

a casing, spaced horizontal air inlet pipes within said casing, gas burner tubes arranged in alternate relation with said air inlet pipes and coacting therewith to form a grid dividing said casing into upper and lower compartments andrefractory aggregates disposed within said upper compartment and supported by said grid.

17. In apparatus of the type described, a easing, vspaced parallel gas burner tubes arranged within said casing, and refractory aggregates within said casing and resting upon said burner tubes.

1S. In apparatus of the type described, a casing, spaced parallel gas burner tubes arranged within said casing, refractory aggregates within said easing and resting upon said burner tubes, and spaced Vertical outlet tubes upon each of said gas burner tubes and extending upwardly intermediate said refractory aggregates.

19. In apparatus of the type described, acasing, spaced parallel gas burner tubes arranged within said casing, supports arranged intermediate said gas burner tubes and coacting therewith to form a grid, and refractory aggregates within said casing and supported by said grid.

20. In apparatus of the type described, a casing, spaced parallel gas burner tubes arranged within said casing, supports arranged intermediate said gas burner tubes and coacting therewith to form a grid, refractory aggregates within said casing and supported by said grid, and spaced vertical outlet tubes upon each of said gas burner tubes and extending upwardly intermediate said refractory aggregates.

In testimony whereof I affix my signature in presence of two witnesses.

ROBERT WAL'l'ON WIEDERWAX.

Witnesses EMMA I'I. YARD, GLADYS'M. BARBoUR. 

